7 Local AI Apps With Document Chat Worth Trying on Windows

Most people don't think twice before pasting a contract, a set of medical results, or last year's tax return into a chatbot. But once that file leaves your computer, you have no real idea where it goes, who reviews it, or how long it's kept. For anything sensitive, that's a bad trade.

Local AI apps solve this by running the entire model on your own PC. Nothing gets uploaded, nothing sits on a company's server, and the app works even without an internet connection. The best of these tools go a step further: they let you drop in a document and ask questions about it directly, turning your laptop into a private research assistant. Here are seven that actually deliver on that promise, tested and current for Windows in 2026.

What "Document Chat" Actually Means

Document chat is simple in practice. You upload a PDF, Word file, or text document, the app reads and indexes it, and you ask questions in plain English. The answers come only from what's in that file — not from the model's general training data.

There's an important distinction worth knowing before you pick an app. Some tools are built for a single document at a time: attach a file, ask your question, done. Others are built around retrieval-augmented generation, or RAG, which lets you organize dozens or even thousands of files into a searchable library. Both approaches are useful. Which one you need depends on whether you're chatting with one contract or an entire filing cabinet.

1. AnythingLLM

AnythingLLM organizes your files into "workspaces," each one its own self-contained folder of documents and chat history. Drop in PDFs, Word files, or even scraped web pages, and you can ask questions across the whole collection at once, not just one file. It comfortably handles thousands of documents without slowing down, which makes it the strongest pick here for anyone building a real reference library rather than checking a single file. It's free, and once installed, it runs completely offline.

2. GPT4All

GPT4All is built for people who don't want to think about setup at all. Its LocalDocs feature lets you point the app at a folder and it quietly indexes everything inside, no GPU required. It's a small download and gets you from "never used local AI" to "asking questions about my files" faster than anything else on this list. The feature set is lighter than some competitors, but for straightforward document Q&A, that simplicity is the point.

3. Jan

Jan is fully open source, which matters if you want to know exactly what's happening to your data under the hood. You can attach a PDF or text file directly inside a chat and start asking questions immediately, with no separate setup step. It's a better fit for working through one document at a time than for managing a sprawling archive, but for privacy-conscious users who want auditable software, it's hard to beat.

4. Msty Studio

Msty Studio takes document chat further with "Knowledge Stacks" — you can combine PDFs, folders, notes, and even video transcripts into a single reference base the AI consults while answering. What sets it apart is how approachable it makes a genuinely technical process. There's no vector database to configure or jargon to decode; you just add your files and start asking.

5. Cherry Studio

Cherry Studio is the pick for anyone who bounces between cloud AI models like GPT and Claude and a local model, and wants one window for all of it. Its built-in knowledge base accepts PDFs, Word documents, PowerPoint files, and even Excel spreadsheets, then lets you chat with any of them using whichever model you have connected. Of everything on this list, it supports the widest range of file formats.

6. LM Studio

LM Studio is best known as a fast, polished local chatbot, and its document handling reflects that focus: you can attach files right in a conversation for quick, on-the-spot answers. It's well suited to checking a handful of documents at a time rather than managing a full library — worth knowing upfront so you pick the right tool for the job.

7. Open WebUI (with Ollama)

Open WebUI runs in your browser on top of Ollama and includes built-in document upload and RAG search. Its standout feature is multi-user support, making it a genuinely practical option for a household or small team that wants one shared AI setup everyone can use. It takes a bit more effort to install than the others, since it requires setting up Ollama first, but the payoff is a system built to serve more than one person.

Which One Should You Actually Pick?

One document, right now: Jan or LM Studio
A growing library of files: AnythingLLM
Lowest-effort setup: GPT4All
Want cloud and local models in one app: Cherry Studio or Msty Studio
Multiple people, one shared setup: Open WebUI

The Bottom Line

Every app on this list keeps your files exactly where they belong — on your own machine, under your own control. Pick the one that matches how you actually work, install it, and try it on a real document you have sitting around. Ten minutes in, you'll know if it's a keeper.